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DEVELOPING A SUSTAINABLE PROCESS FOR
UPGRADING GREYWATER MANAGEMENT SYSTEMS
Social Factors: One consideration involved in community-based greywater
system upgrading is the motivation for community
involvement. Two main paradigms for motivation are:
Volunteer-based self-help
Short-term employment
Each approach has its own set of advantages and disadvantages:
Approach: Volunteer Employment
Advantages: Community
ownership
Encourages ongoing
commitment
Encourages
extensive
community
involvement
Job creation
Disadvantages: Hard to get
community involved
in areas with high
unemployment
High Cost
Could interfere
with sense of
community
ownership
Greywater Solutions:
Maintenance: Two major issues affecting greywater interventions are:
Sediment
Trash
Basing maintenance on
community efforts will lead to
greater sustainability. Possible
strategies for establishing
community involvement in
cleaning include:
Setting up a cleaning schedule
Assigning sections of the channel to different people for
regular cleaning
Requesting that EPWP workers help to clean the channel
Logistical support from the municipal government and
partnering NGOs will facilitate effective maintenance. It is
necessary that all stakeholders be informed and on board with
maintenance; so regular meetings - especially among the
community members - are valuable for organising cleaning.
Erosion: Erosion is the removal of soil from a location due to
natural forces such as wind and moving water. Some
greywater issues caused by erosion include:
1. Clogging of channels due to sedimentation
2. Greywater pooling
3. Channel wall collapse To prevent erosion around
greywater channels,
various strategies can be
used, including:
Vegetation
Blankets; mats
Retaining walls
Buried tyres
These interventions help
to stabilize the ground
and minimize erosion.
Problems Due to Greywater:
Greywater is produced by a variety of sources, mostly from washing. It can be contaminated
by various chemicals and germs, which multiply in standing greywater, making pools of
greywater extremely hazardous to health.
Greywater, especially together with food waste, has been attributed to various problems:
Sickness Rashes Smells Maggots
Goals: The purpose of this project is to work in close collaboration with stakeholders and
community members in Langrug to create a process that could be adapted to different areas
of informal settlement upgrading. This project will also produce a guidebook that describes
the process in detail, the team’s application of the process regarding greywater management,
and other greywater management techniques found through web research.
The Process
Soakaway Layered grass and rocks that
provides a bio filter. The two
different layers are designed to filter
the salts and toxins out of the water
before the water is directed
downstream.
Stones and Cement
Channel lined with stones, mortared with
cement. This channel provides a smooth path
for water while also spreading the impact of silt
and erosion throughout the channel.
Vegetated Channel
A channel that uses grass in place of rocks and
cement to hold the channel together. The grass
holds the soil around the channel in place, as well
as filtering some contaminants out of the
greywater, reducing smell and bacteria growth.
Picture taken from http://www.nagreen.com/erosion-control-products/photodegradable-extended-term.php
Picture taken from WPI Cape Town Project Centre 2010 Stormwater Guidebook
Information taken from http://www.metrocouncil.org/environment/water/bmp/CH3_RPPSoilVeget.pdf
As Presented By: Lauren Harris, Andrea Kates, Trevor Masiy, Timothy Momose, Sinazo Ndabambi, Chris Overton, Sibongile Xenxe, Kholeka Xuza